You can use a Single Sign On (SSO) username and password to access the many of the intranet tools listed on this page. Check whether you already have an account or create a new one. Group owners can manage group members here, and send invitations to new users. Groups are used in intranet services for authorization.
The EGI wiki is the main source of project-related and technical information. The EGI wiki is administered and maintained by members of the EGI community. All users with an SSO account can log in. Some namespaces are restricted and editable by members of given groups.
The EGI Foundation uses Indico to plan and manage meetings, from small workshops to large-scale conferences. All users with an SSO account can use it there. (Indico also has its own local accounts, which can be used by people who do not want an EGI SSO account, but want to register to some meeting in Indico.)